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- c++ - What exactly is std::atomic? - Stack Overflow
Objects of atomic types are the only C++ objects that are free from data races; that is, if one thread writes to an atomic object while another thread reads from it, the behavior is well-defined In addition, accesses to atomic objects may establish inter-thread synchronization and order non-atomic memory accesses as specified by std::memory_order
- c++ - How to use std::atomic efficiently - Stack Overflow
std::atomic is new feature introduced by c++11 but I can't find much tutorial on how to use it correctly So are the following practice common and efficient? One practice I used is we have a buff
- What does atomic mean in programming? - Stack Overflow
22 Atomic vs Non-Atomic Operations "An operation acting on shared memory is atomic if it completes in a single step relative to other threads When an atomic store is performed on a shared memory, no other thread can observe the modification half-complete
- linux - How can I use atomic variables in C? - Stack Overflow
The atomic counter is 10000 The non-atomic counter is 8644 The non-atomic counter is very likely to be smaller than the atomic one due to racy access across threads to the non atomic variable Disassembly analysis at: How do I start threads in plain C?
- std::atomic | compare_exchange_weak vs. compare_exchange_strong
@CygnusX1 yes, that is covered in the C++ standard by the rest of the note, which OP left out of the quote: "When a compare-and-exchange is in a loop, the weak version will yield better performance on some platforms When a weak compare-and-exchange would require a loop and a strong one would not, the strong one is preferable " The corollary is that when you're going to loop anyway, there's no
- atomic operations and atomic transactions - Stack Overflow
Can someone explain to me, whats the difference between atomic operations and atomic transactions? Its seems to me that these two are the same thing Is that correct?
- When do I really need to use atomic lt;bool gt; instead of bool?
You need atomic<bool> to avoid race-conditions A race-condition occurs if two threads access the same memory location, and at least one of them is a write operation If your program contains race-conditions, the behavior is undefined
- sql - What is atomicity in dbms - Stack Overflow
The definition of atomic is hazy; a value that is atomic in one application could be non-atomic in another For a general guideline, a value is non-atomic if the application deals with only a part of the value Eg: The current Wikipedia article on First NF (Normal Form) section Atomicity actually quotes from the introductory parts above
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